if you want to run BOTH MSN and WLM then you can do this by installing MSN 7.5 (if you have WLM installed uninstall it first )
then look for your MSN folder in C:\programs and files\(i think its msn messenger but not sure)
then renmae that folder to "msn 7.5" or something else.
then install WLM again and you'll be fine. that way you can use both.
other wise i'd suggest use MSN 7.5 with plus! and Stuffplug